Mercurial > projects > dwt2
diff org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/dnd/DropTargetEffect.d @ 0:6dd524f61e62
add dwt win and basic java stuff
author | Frank Benoit <benoit@tionex.de> |
---|---|
date | Mon, 02 Mar 2009 14:44:16 +0100 |
parents | |
children |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/dnd/DropTargetEffect.d Mon Mar 02 14:44:16 2009 +0100 @@ -0,0 +1,180 @@ +/******************************************************************************* + * Copyright (c) 2007, 2008 IBM Corporation and others. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Eclipse Public License v1.0 + * which accompanies this distribution, and is available at + * http://www.eclipse.org/legal/epl-v10.html + * + * Contributors: + * IBM Corporation - initial API and implementation + * Port to the D programming language: + * Frank Benoit <benoit@tionex.de> + *******************************************************************************/ +module org.eclipse.swt.dnd.DropTargetEffect; + + +import org.eclipse.swt.SWT; +import org.eclipse.swt.graphics.Point; +import org.eclipse.swt.graphics.Rectangle; +import org.eclipse.swt.widgets.Control; +import org.eclipse.swt.widgets.Table; +import org.eclipse.swt.widgets.TableItem; +import org.eclipse.swt.widgets.Tree; +import org.eclipse.swt.widgets.TreeItem; +import org.eclipse.swt.widgets.Widget; +import org.eclipse.swt.dnd.DropTargetAdapter; + + +/** + * This class provides a default drag under effect during a drag and drop. + * The current implementation does not provide any visual feedback. + * + * <p>The drop target effect has the same API as the + * <code>DropTargetAdapter</code> so that it can provide custom visual + * feedback when a <code>DropTargetEvent</code> occurs. + * </p> + * + * <p>Classes that wish to provide their own drag under effect + * can extend the <code>DropTargetEffect</code> and override any applicable methods + * in <code>DropTargetAdapter</code> to display their own drag under effect.</p> + * + * <p>The feedback value is either one of the FEEDBACK constants defined in + * class <code>DND</code> which is applicable to instances of this class, + * or it must be built by <em>bitwise OR</em>'ing together + * (that is, using the <code>int</code> "|" operator) two or more + * of those <code>DND</code> effect constants. + * </p> + * <p> + * <dl> + * <dt><b>Feedback:</b></dt> + * <dd>FEEDBACK_EXPAND, FEEDBACK_INSERT_AFTER, FEEDBACK_INSERT_BEFORE, + * FEEDBACK_NONE, FEEDBACK_SELECT, FEEDBACK_SCROLL</dd> + * </dl> + * </p> + * + * @see DropTargetAdapter + * @see DropTargetEvent + * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> + * + * @since 3.3 + */ +public class DropTargetEffect : DropTargetAdapter { + Control control; + + /** + * Creates a new <code>DropTargetEffect</code> to handle the drag under effect on the specified + * <code>Control</code>. + * + * @param control the <code>Control</code> over which the user positions the cursor to drop the data + * + * @exception IllegalArgumentException <ul> + * <li>ERROR_NULL_ARGUMENT - if the control is null</li> + * </ul> + */ + public this(Control control) { + if (control is null) SWT.error(SWT.ERROR_NULL_ARGUMENT); + this.control = control; + } + + /** + * Returns the Control which is registered for this DropTargetEffect. This is the control over which the + * user positions the cursor to drop the data. + * + * @return the Control which is registered for this DropTargetEffect + */ + public Control getControl() { + return control; + } + + /** + * Returns the item at the given x-y coordinate in the receiver + * or null if no such item exists. The x-y coordinate is in the + * display relative coordinates. + * + * @param x the x coordinate used to locate the item + * @param y the y coordinate used to locate the item + * @return the item at the given x-y coordinate, or null if the coordinate is not in a selectable item + */ + public Widget getItem(int x, int y) { + if ( auto table = cast(Table)control ) { + return getItem(table, x, y); + } + if ( auto tree = cast(Tree)control ) { + return getItem(tree, x, y); + } + return null; + } + + Widget getItem(Table table, int x, int y) { + Point coordinates = new Point(x, y); + coordinates = table.toControl(coordinates); + TableItem item = table.getItem(coordinates); + if (item !is null) return item; + Rectangle area = table.getClientArea(); + int tableBottom = area.y + area.height; + int itemCount = table.getItemCount(); + for (int i=table.getTopIndex(); i<itemCount; i++) { + item = table.getItem(i); + Rectangle rect = item.getBounds(); + rect.x = area.x; + rect.width = area.width; + if (rect.contains(coordinates)) return item; + if (rect.y > tableBottom) break; + } + return null; + } + + Widget getItem(Tree tree, int x, int y) { + Point point = new Point(x, y); + point = tree.toControl(point); + TreeItem item = tree.getItem(point); + if (item is null) { + Rectangle area = tree.getClientArea(); + if (area.contains(point)) { + int treeBottom = area.y + area.height; + item = tree.getTopItem(); + while (item !is null) { + Rectangle rect = item.getBounds(); + int itemBottom = rect.y + rect.height; + if (rect.y <= point.y && point.y < itemBottom) return item; + if (itemBottom > treeBottom) break; + item = nextItem(tree, item); + } + return null; + } + } + return item; + } + + TreeItem nextItem(Tree tree, TreeItem item) { + if (item is null) return null; + if (item.getExpanded() && item.getItemCount() > 0) return item.getItem(0); + TreeItem childItem = item; + TreeItem parentItem = childItem.getParentItem(); + int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem); + int count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount(); + while (true) { + if (index + 1 < count) return parentItem is null ? tree.getItem(index + 1) : parentItem.getItem(index + 1); + if (parentItem is null) return null; + childItem = parentItem; + parentItem = childItem.getParentItem(); + index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem); + count = parentItem is null ? tree.getItemCount() : parentItem.getItemCount(); + } + } + + TreeItem previousItem(Tree tree, TreeItem item) { + if (item is null) return null; + TreeItem childItem = item; + TreeItem parentItem = childItem.getParentItem(); + int index = parentItem is null ? tree.indexOf(childItem) : parentItem.indexOf(childItem); + if (index is 0) return parentItem; + TreeItem nextItem = parentItem is null ? tree.getItem(index-1) : parentItem.getItem(index-1); + int count = nextItem.getItemCount(); + while (count > 0 && nextItem.getExpanded()) { + nextItem = nextItem.getItem(count - 1); + count = nextItem.getItemCount(); + } + return nextItem; + } +}